Programming Windows Sixth Edition is available now in PDF, ePub, and MOBI formats. If you buy between now and May 31, 2012, the cost is an astonishing low $10. And the price goes up over time, so act fast: From June 1, 2012 until sometime in July, the cost will be $20. And then $30, and the eventually the book will reach its final and normal cost of $50.

The catch is that this is a book in progress. So the version you’re getting today is the so-called Consumer Preview version, and it covers 7 chapters over 294 pages (described below), focusing on C# and XAML technologies. Mr. Petzold will be updating the book over time, with a Release Preview version expected sometime in July and then the final version later in the year. Anyone who buys the book qualifies for free upgrades to future versions. So if you buy today, you’ll get the subsequent revisions as they are published.

In the current version of the book, you’ll find the following content: